what is water harvesting ? how can this technique help in the conservaiton of water ?

Water harvesting is the method of storage of water in tanks or in roofs so that we can consume it later on demand. It is also known as Rainwater harvesting.

This technique help in the conservation of water as follows :- 
  • We can clean our roofs and fit some pipes going in a clean tank setup at ground level or anywhere else.
  • The rainwater will come on the roof by the clouds and gets collected and transferred to the tank.
  • We can also transfer the water to the ground via the pipe.
This technique helps us in time of summer or scarcity of water , when we need we can use the water of the storage tank, or we can take out the water of ground with the help of handpump.

Hope this information clear your doubts.
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conservation of water.
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conservation of water
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conservaton of water
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Water harvesting is the collection of runoff for productive purposes. Instead of runoff being left to cause erosion, it is harvested and utilized. In the semi-arid drought-prone areas where it is already practised, water harvesting is a directly productive form of soil and water conservation.
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Methods :-

    Rain water may be collected and recharged into the ground water aquifers through the following methods - roof top harvesting and harvesting rain water from open spaces. Roof top harvesting has been practised since ages. Even today it is practised in many places throughout the world. As we know the rain water collected from the terrace is free from any bacteriological contamination except small amount of dust and other silt particles which can be filtered. It can be diverted to the existing wells/ borewells which are in use.

In the open well method all the rain water falling on the terrace of the building is collected through pipe lines and diverted into an existing open well through a filter tank/chamber. The filter chamber helps to filter fine dust, silt and other small floating particles such as leaves which are normally found on the terrace.

    The size of the filter chamber depends on the amount of rain water flows from the terrace. The bottom of the chamber is filled with broken bricks followed by gravels and coarse river sand on the top. The location of the chamber is preferred based on the site conditions either below or above ground level.As in the case of open wells, the rain water from the terrace may be diverted to a bore well also . In this case it is to be kept in mind that during excess rain fall, the rate of recharge may not match the rate of rainfall. In such situations, a percolation pit has to be provided nearby to divert the excess flow of rain water. Defunct bore wells which are not in use may also be converted in to a recharge well.

    Various kinds of recharge structures are possible which can ensure that rain water percolates in the ground instead of draining away from the surface. While some structures promote the percolation of water through soil strata at shallow depth (e.g. percolation/recharge pits, recharge trench, etc) others conduct water to depths from where it joins the ground water (e.g. percolation pit with bore trench with bores/recharge well etc.)

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Conservation of water will help to fullfil our needs and replnish water table
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Water harvesting, also known as rainwater harvesting is the storage of runoff water for reuse rather than allowing it to run off. This technique helps in the conservation of water as : 1. It reduces the demand on groundwater. 2. It reduces flood and soil erosion. 3. It is suitable for irrigation. Hope it helped..
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